Airmar M192 User Manual

INSTALLATION INSTRUCTIONS

seamless
pipe

M192-NAV Transducer

Installed in Lloyd’s Type Approved, Tank, CS235

IMPORTANT: Please read the instructions completely before
proceeding with the installation. These directions supersede
instructions in your instrument manual if they differ.

WARNING: NEVER USE SOLVENTS!

Cleaners, gasoline, paints, sealants, and other products may

17-174-01 rev. 1 2/99

contain strong solvents, such as acetone, which can attack many
plastics dramatically reducing their strength.

Tools and Materials Needed

Water-based antifouling paint (mandatory in salt water)
Cable gland
Junction box
Underwater lubricant such as Aqualube
Hex wrench: 8M
Marine sealant

NOTE: The terms tank and housing are used interchangeably.

Antifouling Paint

Surfaces exposed to salt water must be coated with
antifouling paint. Paint the housing with an appropriate
antifouling, corrosion inhibiting coating. Use only water-
based antifouling paint on the radiating face of the
transducer. Never use ketone-based paint on the
transducer’s face since ketones can attack many plastics
possibly damaging the transducer. It is easier to apply
antifouling paint before installation, but allow for sufficient
drying time.

Installing the Transducer and Cable

Caution: Never pull, carry, or hold the transducer by the
cable as this may sever internal connections.

1. Inspect the transducer, cable, and connectors carefully
before installing. All parts must be clean and free of oil,
grease, paint, solvents, and other foreign material that
may hinder performance.

2. Pull the tagged end of the transducer cable
(P/N 22-136-01) through the housing cable passage
and the seamless pipe until the cable stop is seated
firmly against the cable passage opening (see Figure 1).

®

cable

passage

cable

stop

cable

loop

connectors

transducer

radiating face counterbore (3) flange

tank
(housing)

cable
storage
cavity

rubber
retaining
ring (3)

mounting
screw (3)

Figure 1. Installation

Approximately 305mm (12") of cable will remain in the
housing with the male connector attached.

3. Use a suitable cable gland at the top of the pipe to
support and clamp the cable.

4. Secure the free end of the cable in a junction box
located in a dry, gas free environment within the ship.

Caution: The transducer’s mounting screws utilize
rubber retaining rings to hold the screws in place
during installation. Do not remove them.

5. Carefully push the socket head end of each mounting
screw into the counterbore of the transducer to fully
expose the threaded end of the screw. Sparingly apply
a uniform coat of Aqualube

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or other similar

underwater lubricant to the screw threads.

Caution: Lubrication is vital to the removal of these
screws should replacement of the transducer ever be
required.

6. Push the threaded end of each screw back into the
transducer until approximately 7mm (0.25") of the
lubricated threads are exposed and held in place by
the retaining ring.

7. While supporting the weight of the transducer, plug the
mating connectors together until they are fully
engaged. The connector faces must touch.

8. Slowly rotate the transducer approximately 1 to 2 turns
as it is raised into the housing to properly dress the
cable and joined connectors in the cable storage
cavity. The transducer face will be almost flush with the
flange of the housing when the cable is properly
stowed and the mounting screws are seated in the
threaded holes of the housing.

Note: For diver installations, we suggest attaching the
hex wrench to a lanyard.

9. Tighten each of the mounting screws using the hex
wrench until the transducer is secured in the housing
and does not move. The recommended tightening
torque is 20N-m (15ft-lb). Fill the screw heads and
counterbores with marine sealant until they are flush
with the transducer’s radiating face. Remove any
excess sealant to ensure smooth water flow over the
transducer (see Figure 2).

Maintenance

counterbore
filled with
marine sealant

Aquatic growth can accumulate rapidly on the transducer’s
surface reducing the performance in weeks. Clean the
surface with a soft cloth and mild household detergent.
Reapply antifouling paint every 6 months.

Transducer Replacement

The information needed to order a replacement Airmar
transducer is printed on the vinyl tag affixed to the
transducer cable. Do not abrade the marking or remove
this tag. Contact your marine dealer or echosounder
manufacturer to obtain a replacement. When ordering,
specify the frequency, date code, and part number
(see Figure 3).

Figure 2. Bottom view including transducer’s radiation face

frequency

lot number

01-0797

120kH

KXQY9A/ XX-XXX

U.S.PAT.# XXXXXXX

date code

part number

Figure 3. Sample vinyl tag

®

AIRMAR

2

TECHNOLOGY CORPORATION

35 Meadowbrook Drive, Milford, New Hampshire 03055-4613, USA

www.airmar.com